?Zri operates a business as a designer of internet web pages for a variety of business clients. Unfortunately he?has had some difficulty in recovering his full fees from a number of clients as follows:

?Ad, a self-employed car mechanic, without contacting Zri, simply sent him a cheque for half of his fees?stating that he could not pay any more and that the cheque was in full settlement of his outstanding debt. Zri?rang Ad about this and reluctantly agreed to waive half the fees.?

Bi, a newly qualified accountant, told Zri that although she could only raise the cash to pay half of the?outstanding fees she would, as an alternative to paying the other half, do all of Zri's accountancy work for?the coming year. Zri reluctantly agreed to this proposal.?

Cas, a self-employed musician, told Zri that she could not pay any of the money she owed him. However, her?father offered to pay Zri, but could only manage half of the total amount owed. Once again Zri reluctantly?agreed to accept the father's payment of the reduced sum.?